Gage.



J. ELJOHNSON,

GAGE. 7 APPLICATION FILE D JUNE 17' I915- Patented Deg. 18; 1917.

. oan E; JoHNsorT, OE BROOKLYN, Ew ortK. i

. ToxaZZ whom it may concern Be it' known that I, JOHN 'E. JOHNSON,

a citizen of'the United States, residing at Brooklym county of Kings'State of New,

York, have made a certain new. and useful Invention inGages, of which the following is a specification-Z V This invention relatesto cal to manufacture and efficient in opera tion;*

with accuracy on a flatround disk or surface or to mark lines, diagrams or designs on such surface and .an'y desired distance from the center of the disk or on lines paralp integrally with 1t a stralght edge member lel to the diameter ofsuch disk or surface.

Other objects" of the invention willap pear more fully hereinafter.

The invention consists substantially in the construction, combination, location and relative arrangement of parts all as will be more fully hereinafter set forth, as shown in the accompanying drawing, and finally pointed out in the appended claim. 7

Referring to the accompanying V drawing heretofore experienced considerable difii-' culty in properly and accurately laying out work, diagrams, designs or the like on a flat surface of a cylindrical disk and particularly along lines which are required to 'be at definite distances from the center of the disk and parallel to diametric lines of the disk. Also inlaying out. centers on such round surfaces, or points on the ends of a shaft where cam or eccentric action is required. Such difliculty has arisen by reason of the fact that no adequate tool for securing'the desired measurements of distances off center of the disk or round surfaces has b r a l bl is t WP It i was I gages andipan ticularly to tools of this nature designed-to I lay out work on a flat round disk orsurfaceL The object of the invention is to provide a gage which is simple in structure, economn r Specification of-Letters lf atent'. pggt t d D c s, 1917;,

f Applicationfiled June 17,1915. Sc. 1'ia1.-I\T0'3 the'specia l purposesofmy present invention to providea gage ofeXceedingly simple v structure by which lines or other points may be accurately laid-0E eitherdiametrically. through the center ofthe disk or fat. accurately adjusted distances from and 'paral-fl lel to suchdiametric line. y I

In carrying-out my: invention lgprovide. a-base' 5 having laterallyextending arms 6- at one :edge thereof,- said arms having sur-,-

-- faces-7 formed: at an angle ofexactly 90, Y 1

to each other. These surfaces are designed to straddleithe work 8, thereby locating the centeiwoff a rounchor circular dlsk in a line. a v

which ibisects thewangle between. the sur faces? "of :the arms 6.= Applied to; the .side surface ofithe base 5 is a slide plate 9 arrangedtodnove in a straight line at right 'angles to: a. line bisecting the angle of the, 1'

surfaces 7. 1 This uslide .plate has formed 1,0,whic'h extends from one edge and. at e'X- actlyright angles to the line of enclwi e movementofsaid plate 9. The base 5' is provided with an'indicating point 11, preferably located in the line of the bisector of the angular surfaces '7 and consequently in line with the geometric center point of the round or circular disk or work 8. Cooperating with this mark 11 is-a scale indicated at 12 on the side of theplate 9; By suitably shifting the plate 9 endwise to any desired position as measured bythe scale 12 and 'mark 11, the straight edge 10 is correspondingly shifted with absolute accuracy to any desired position off. centerwith reference to,

the disk and parallel to, the'bisector of the angle between surfaces 7 therebyenabling the desired lines, diagrams, designs or points off center with respectto the disk, and on either side of thecenter thereof, to 1 be laid off or marked upon the surface of the disk. Y

The plate 9. may be held upon the base 5 and guided in its rectilinear adjustments 1n any suitable or convenlent manner. I

have shown straps 13 which are arranged at the ends of the base 5 and engaged overthe plate 9, and. releasably secured to the base plate in any suitable manner, as, for instance, by thumb nuts 14. By loosening the nuts 14 plate 9 may vbe shifted to the desired extent and in either direction and then clamped and held in adjusted position y ght nin 1. 1 i t e h m wa The plate 9 may be shifted or moved in any suitable or convenient manner to secure the desired adjustments thereof.

I have shown a simple arrangement for this purpose wherein an adjusting screw 15 is tapped through a lug 16 formed on one of the clamp straps 13, said screw 15 being held in a collar 17 carried by the end of plate 9. The adjusting screw 15 is also provided with a thumb piece 18 by which said screw may be rotated to secure the de-. sired adjustment of said plate;

In Fig. 4 I have indicated various designs of work laid out or diagrammed upon the surface of acircular disk by the use of gage embodying my invention and from an inspection of which it will be observed various designs may be accurately laid out on the surface of a round disk or other similar piece of, work in lines parallel to but off center from diametric lines to such surface. r

The advantages derived from the use of a scale embodying my invention are many and obvious. Not only may work be laid out on circular surfaces in ofl center relation with respect to such surface w1th abso-- lute accuracy but also with expedition thereby saving time in laying outthe work, in

locating eccentric pivot axes for shafts, cam

Copies of this patent may be obtained for five cents eachyby addressing; the Commissioner? of Patents,

disks or the like and for many other purposes.

Having now set forth the object and nature of my invention and a structure embodying the principles thereof, what I claim as new and useful and of my own invention and desire to secure by Letters Patent, is,

A gage comprising a base member having lateral surfaces arranged at a right angle to each other, and a plate member placed flatwise against the: base member-anda-r I in adjusted position.

In testimony whereof I have hereunto set my hand in the presence of the subscribing witnesses, on this 14th day of June, A. D.,

v 7 JOHN E. JOHNSON;

Witnesses: g

A. GRAEVE, S. E; DARnY.

Washington, D. C. 

